Format Feed Title to RSS feed

Hi,
I am using virtue theme and have placed a side bar with page builder to the right of my page. I have a box set up for an RSS feed. I have the option to “Give the feed a title (optional):” but I don’t see how I can style it? I’d like to change the background color behind the title text (not the entire box the rss feed is in) and also change the font color to the Title.
Any help would be great! thanks!